Example from a SAML Response:

<saml2:NameID Format="urn:oasis:names:tc:SAML:2.0:nameid-format:persistent" 
NameQualifier="https://testsp2.aai.dfn.de/shibboleth"; SPNameQualifier="h
ttps://testsp2.aai.dfn.de/shibboleth">3x51T1uQTYjBNVWkRoLPdzSkgCE=</saml2:NameID>

It seems in SamlProfileSamlNameIdBuilder#finalizeNameId the NameQualifier 
is not set correctly. If no explicit nameIdQualifier is set for a 
SAMLService, the NameQualifier has to be the entityId of the IdP or of the 
relying party.
In all of my testcases the NameQualifier was set to the issuer of the 
AuthnRequest, which is the SP.
Thats why the Shibboleth SP ignores the subject ID.

My quickfix would be the use the entityId of the IdP, but that will not 
handle relying IdPs. 

Is it a bug? Should I open a PR?

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